日光におけるミズナラ個体群の再生産過程の解析 : I.3林分における種子落下量及び稚樹成立についての数年間の記録

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KANAZAWA, Yoichi (For. & For. Prod. Res. Inst., Ibaraki), 1982. Some analyses of the reproduction process of a Quercus crispula BLUME population in Nikko. I. A record of acorn dispersal and seedling establishment for several years at three natural stands. Jap. J. Ecol., 32 : 325-331. Acorn and cup dispersal of Quercus crispula was measured for 3 or 5 years at three natural stands. The number of dispersed acorns varied either year to year or between stands, ranging from 0.3 to 39.9 per m^2. The number of dispersed acorns was usually about 90% of dispersed cups. The number of established seedlings after experiment was 0.24,0.09 and 0.05 per m^2 at stands A, B and C, respectively. Based on these values, the remaining process from the production to the establishment of acorns or seedlings for 5 years was estimated at stands A and B. According to this estimation, about 15% of produced acorns was eaten or carried away by animals on the tree, and out of the rest only a few developed to seedlings on the forest floor. This decrease of acorns was thought to be owing to predation by animals. Hence, for the successful regeneration of this species, the following conditions seem to be needed ; the sufficient supply of acorns so as to survive despite predation by animals, the removal of upper layers to light up the forest floor, and keeping off the invasion of other plants suppressing the growth of Q. crispula.
日本生態学会の論文
1982-09-30